Re: [Mingw-users] undefined reference after upgrade to Mingw 2.0

[Oscar F. <of...@wa...>]

Gilles Depeyrot <Gil...@wa...> writes:

> Hi,
> 
> I am evaluating upgrading from Mingw gcc-2.95.3-6 to Mingw gcc-3.2
> from Mingw 2.0-3. I have successfully compiled/linked/executed C code
> using the upgraded compiler. However, I am unable to link C++ code
> which works fine with gcc-2.95.3. The link error messages resemble
> (simplified symbols because I don't have them at hand):
> 
> undefined reference: '_GLOBAL_I_...'
> undefined reference: '_GLOBAL_D_...'
> 
> I have no idea what these symbols are. They seem to be displayed
> mangled but c++filt does not demangle them (even when adding extra _
> in front).
> 
> Any idea how to track down what the problem is?

You provide little information (a test case would be nice to have).

Let's try this one:

Are you linking C++ libraries compiled with g++ 2.9x? 3.x sports a new
ABI, which means that g++ 3.x only can use C++ code compiled by
itself. (Actually, g++ 3.2 is incompatible with previous versions
too).

-- 
Oscar